Hi Michael,
On Thu, Feb 18, 2021 at 11:11 PM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
On 19/02/21 12:19 am, Arnd Bergmann wrote:
drivers/net/ethernet/8390/apne.c
drivers/net/ethernet/8390/ax88796.c
drivers/net/ethernet/8390/hydra.c
drivers/net/ethernet/8390/mac8390.c
drivers/net/ethernet/8390/ne.c
drivers/net/ethernet/8390/zorro8390.c
[...]
Most of these are normal short-lived interrupts that only transfer
a few bytes or schedule deferred processing of some sort.
Most of the scsi and network drivers process the data in
a softirq, so those are generally fine here, but I do see that 8390
(ne2000) ethernet and the drivers/ide drivers do transfer their
data in hardirq context.
Arnd
8390 ethernet drivers are widely used on m68k platforms (Amiga and
Atari). At least on Amiga, the corresponding interrupt is a hardirq so
I'd advise caution. That said, the 8390 drivers might benefit from some
refactoring (the way these drivers are compiled does prevent e.g. the
APNE driver from being used with two different variants of PCMCIA
interfaces. I had begun some work on making IO primitives runtime
selected two years ago but that ended up looking too ugly ...).
Can't recall what IPL the 8390 interrupts operate at - Geert?
#define IRQ_AMIGA_PORTS IRQ_AUTO_2
Zorro expansion boards can also use
#define IRQ_AMIGA_EXTER IRQ_AUTO_6
and some boards may have a jumper to select the latter, but all Amiga
Linux drivers use IRQ_AMIGA_PORTS.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
